# coding=utf-8
# Copyright 2024 The Google Research Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""PNG compression utilities."""

import io
import numpy as np
from PIL import Image


def compress_image(img_obs):
  pil_img = Image.fromarray(img_obs)
  img_buf = io.BytesIO()
  pil_img.save(img_buf, format='PNG')
  img_bytes = img_buf.getvalue()
  return img_bytes


def decompress_image(img_bytes):
  img_buf = io.BytesIO(img_bytes)
  pil_img = Image.open(img_buf)
  img_obs = np.array(pil_img)
  return img_obs
